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3 years ago

How many valence electrons are there in Se atom?

Chemistry

2 answers:

a_sh-v [17]3 years ago

7 0

Answer:

The numer of valence electrons is defined as the number of electrons present in the outer most shell of the atom.So, in the case if selenium, there are 6.

Lena [83]3 years ago

5 0

Answer:

4 valence electrons

Despite the fact that the word silicon has a ubiquitous affiliation with all things electronic, Si itself is not a good electrical conductor. It has 4 valence electrons, meaning that filling its outer shell it can form a very strong lattice with 4 neighboring Si atoms-with no un-bonded electrons remaining

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8.00ml of 1.25M lithiukm hydroxide is reacted with sulfuric acid. It is found that 52.87mL of the sulfuric acid is required to c

BabaBlast [244]

Answer: The molarity of sulfuric acid is 0.0946 M

Explanation:

To calculate the concentration of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2SO_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is LiOH

We are given:

$n_1=2\\M_1=?M\\V_1=52.87mL\\n_2=1\\M_2=1.25M\\V_2=8.00mL$

Putting values in above equation, we get:

$2\times M_1\times 52.87=1\times 1.25\times 8.00\\\\M_1=\frac{1\times 1.25\times 8.00}{2\times 52.87}=0.0946M$

Hence, the molarity of sulfuric acid is 0.0946 M

8 0

4 years ago

How do you balance this?

ad-work [718]

Weigh them both and there you go

8 0

3 years ago

The symbols used on a map are explained in the

Nady [450]

Answer - LEGEND

The legend of a map is also called the map key. It is the part included in a map to, as it were, unlock the map. The legend (or map key) gives explanation to what each symbol and color used in the map represents.

5 0

4 years ago

Why did engineers need to design a sunshade for Mercury Messenger?

zloy xaker [14]

The answer is so it didn't burn.

8 0

3 years ago

Read 2 more answers

Calculate the molality of an ethylene glycol (C2H6O2) soltuion, that has a molarity of 2.07 M. The density of the solution is 1.

vlada-n [284]

Answer:

2.03

Explanation:

Let's assume we have 1 L of the solution:

There would be 2.07 ethylene glycol moles.

The solution would weigh (1000 mL * 1.02 g/mL) = 1020 g.

With that information we can calculate the molality:

molality = moles of solute / kg of solvent

molality = 2.07 moles / (1020 ÷ 1000) = 2.03 m

Keep in mind that this is only an estimate, as we used the kg of the solution and not of the solvent.

3 0

3 years ago